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Intrinsic isotropic near-zero thermal expansion is discovered in borate crystal Zn4B6O13 with high transparency in the ultraviolet region. First-principles calculations demonstrate that the very low thermal expansion originates mainly from the invariability of the solid B24O48 truncated octahedra that are fixed by the Zn4O13 clusters in the ZBO structure.
Jiang et al. (Mon,) studied this question.